Merriam — Nineteen New Bears from Western America. 153 



Compared -with old male selkirki from Selkirk Range, southeastern 

 British Columbia (the type): Size somewhat greater; agreeing in great 

 breadth of postorbital processes, but differing as follows: fronto-nasal 

 region more dished ; frontals rising more abruptly at orbits ; frontal shield 

 concave between postorbital processes ; postorbitals elevated ; upper part 

 of orbital rim swollen and elevated ; nasals more flattened and much 

 more strongly dished ; zygomata more broadly outbowed and more arched ; 

 coronoid blade much higher. 



Compared with adult male canadensis from Moose Pass, eastern B. C. 

 (No. 174511, the type) with which it agrees essentially in basal and 

 occipito-sphenoid length: frontal shield less flat, more elevated laterally, 

 highest at postorbitals instead of at posterior point; fronto-nasal region 

 more dished ; rostrum smaller, narrower basally, more strongly com- 

 pressed below nasals ; postorbital processes very much larger, broader, 

 and more massive, elevated, arched and subtriangular, instead of slender 

 and narrowly peglike ; zygomata more outbowed and arched ; sagittal 

 crest low and straight instead of high and arched ; inion less developed ; 

 braincase anteriorly broader and more depressed — not tending to ' keel' 

 into sagittal crest as in canadensis; occipito-nasal length less, although 

 basal length of skull is essentially the same in both. Lower jaw longer; 

 inferior border of ramus shorter and more strongly bellied ; coronoid blade 

 higher and more falcate, its apex reaching farther posteriorly; distance 

 from angle to subangular process much greater; diastema in both jaws 

 much longer. Last upper and middle lower molars not quite so broad. 



Compared with adult male absarokus from north end Bighorn Mts., 

 eastern Montana (No. 67391, the type): Size smaller; vault of cranium 

 decidedly lower; braincase anteriorly broadly depressed; frontal shield 

 narrower, lower and flatter, concave instead of convex between postor- 

 bital processes; postorbital processes (viewed from above) broadly trian- 

 gular, uplifted and somewhat arched instead of peg-shape; orbital rims 

 more thickened and elevated ; rostrum smaller, lower, more slender, and 

 much more compressed horizontally between nasals and roots of canines, 

 making the nasals appear elevated ; sagittal crest lower; occipito-sphenoid 

 shorter; occiput lower ; anterior nares smaller. Lower jaw shorter ; in- 

 ferior border of ramus much shorter ; coronoid blade more falcate, its 

 apex reaching farther posteriorly; angular process more slender and 

 more produced posteriorly ( line connecting apex of coronoid with angle 

 passing well behind condyle — in absarokus cutting condyle near middle). 

 Molars smaller. 



Compared with old male horriaeus from New Mexico (the type) with 

 which it agrees in size, proportions, and general characters: Frontal 

 shield rising more strongly anteriorly, highest at postorbitals [in horriaeus 

 highest at point] , longer pointed ; postorbital processes broader at base 

 and more definitely triangular as seen from above ; fronto-nasal region 

 more dished ; sides of rostrum more compressed horizontally below 

 nasals ; skull broader across squamosals ; squamosal shelf longer antero- 

 posteriorly, its outer free edge straighter (less incurved); xygomatamore 



